package com.tanhua.server.interceptor;

import com.tanhua.common.pojo.User;
import com.tanhua.common.utils.NoAuthorization;
import com.tanhua.common.utils.UserThreadLocal;
import com.tanhua.server.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 */
@Component
public class UserTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private UserService userService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //校验handler是否是HandlerMethod
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        //判断是否包含@NoAuthorization注解，如果包含，直接放行
        if (((HandlerMethod) handler).hasMethodAnnotation(NoAuthorization.class)) {
            return true;
        }

        //获得请求头中的token
        String token = request.getHeader("Authorization");
        //校验token
        User user = userService.queryUserByToken(token);
        if (user != null){
            UserThreadLocal.set(user);
            return true;
        }

        //响应回去状态码401，表示无权限
        response.setStatus(401);
        //不放行
        return false;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //用户请求结束，删除ThreadLocal中的user
        UserThreadLocal.remove();
    }
}
